To: George White <gwhite@bodnext.bio.dfo.ca>
Subject: Re: [R] [Q] use of expression() in plot() vs. hist()
From: Peter Dalgaard BSA <p.dalgaard@biostat.ku.dk>
Date: 18 Feb 1999 19:41:52 +0100
In-Reply-To: George White's message of Thu, 18 Feb 1999 14:12:52 -0400 (AST)
George White <gwhite@bodnext.bio.dfo.ca> writes:
> > First of all, I don't know where people are getting that paste()
> > construction from. The juxtaposion operator for plotting math is "*",
> > i.e.
> >
> > hist(c(0,0,0,0,4,5,6,6,6,8), xlab=expression("scaled "*rho))
> >
> The use of "paste" comes from careful reading of the documentation:
>
> > ?legend
> [...]
> ex.cs1 <- expression(plain(sin) * phi, paste("cos", phi))# 2 ways
> legend(-3, .9, ex.cs1, lty=1:2, col=2:3)
>
> "paste" and "*" are both used in "?text" as well.
I might have checked....
Anyways, there's clearly a bug in the implementation of paste(), so
'*' should be used for now.
Specifically:
static BBOX RenderConcatenate(SEXP expr, int draw)
{
BBOX bbox;
int i, n;
expr = CDR(expr);
n = length(expr);
for (i = 0; i < n; i++) {
bbox = CombineBBoxes(bbox, RenderElement(CAR(expr), draw));
if (i != n - 1)
....
starts with an uninitialised bbox, which looks unhealthy to me.
-- O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) FAX: (+45) 35327907 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._